Batch Processing:

- Replaced CampaignBudgetServiceClient and CampaignServiceClient with the unified GoogleAdsService.
- Implemented MutateOperation for both budget and campaign.
- Used temporary resource IDs (e.g., customers/{customer_id}/campaignBudgets/-1) to allow the campaign to reference the budget created in the same request.
- Executed both operations in a single mutate call.

async_search_stream.py
Query Optimization:
- Removed LIMIT 10 from the GAQL query to correctly illustrate "getting all campaigns" as per the example's purpose.`

sync_search.py
Query Optimization:
- Removed LIMIT 10 from the GAQL query to correctly illustrate "getting all campaigns" as per the example's purpose.

Merge branch 'opt_asyncio' of https://github.com/googleads/google-ads-python into opt_asyncio

Author: bobhancockg